Noncoherent iterative (turbo) decoding

Previously, noncoherent sequence detection schemes for coded linear and continuous phase modulations have been proposed, which deliver hard decisions by means of a Viterbi algorithm. The current trend in digital transmission systems toward iterative decoding algorithms motivates an extension of thes...

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Veröffentlicht in:IEEE transactions on communications Jg. 48; H. 9; S. 1488 - 1498
Hauptverfasser: Colavolpe, G., Ferrari, G., Raheli, R.
Format: Journal Article
Sprache:Englisch
Veröffentlicht: New York IEEE 01.09.2000
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Schlagworte:
Algorithms
Coherence
Concatenated codes
Continuous phase modulation
Convolutional codes
Decoding
Digital
Instability
Interleaved codes
Iterative algorithms
Iterative decoding
Phase detection
Phase frequency detector
Stability
Trends
Turbo codes
Viterbi algorithm
ISSN:0090-6778, 1558-0857
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Zusammenfassung:Previously, noncoherent sequence detection schemes for coded linear and continuous phase modulations have been proposed, which deliver hard decisions by means of a Viterbi algorithm. The current trend in digital transmission systems toward iterative decoding algorithms motivates an extension of these schemes. In this paper, we propose two noncoherent soft-output decoding algorithms. The first solution has a structure similar to that of the well-known algorithm by Bahl et al. (1974), whereas the second is based on noncoherent sequence detection and a reduced-state soft-output Viterbi algorithm. Applications to the combined detection and decoding of differential or convolutional codes are considered. Further applications to noncoherent iterative decoding of turbo codes and serially concatenated interleaved codes are also considered. The proposed noncoherent detection schemes exhibit moderate performance loss with respect to corresponding coherent schemes and are very robust to phase and frequency instabilities.
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ISSN:0090-6778
1558-0857
DOI:10.1109/26.870016